Hi Fulvio !!!
Thank you for your product, a good solution to many problems ...
I would like to know you over here on this topic
http://zeroshell.net/eng/forum/viewtopic.php?t=790&highlight=vlan+pppoe
I have installed version 12 beta and version 11beta neither there nor there is not works ..
The question can I do something wrong but when you create a PPPoE connections in column "Ethernet Modem connected to" does not select the VLAN, but only ETH00 or ETH01.
How can I change it ???

VLANs I have registered on the interface ETH02 ...
When you create a PPPoE settings "Ethernet Modem connected to" does not select the VLAN, but only ETH00 - ETH03.
When I created our test on one VLAN on each interface
ETH00 vlan 2000
ETH01 vlan 2001
ETH02 vlan 2002
ETH03 vlan 2003
In the settings of PPPoE "Ethernet Modem connected to" interface appeared ETH00 vlan 2000, and all the other interfaces remain unchanged ...

The bug manifests itself as an inability to select a VLAN when attempting to configure a PPPoE interface because only some of the VLANs are shown by the GUI. Selecting the basic interface ie ETHn works correctly.